The Beretta Modello 1951 (M1951) is a historic piece for Italian handguns as it was the first Beretta chambered in 9x19mm Parabellum and was also the first Italian locked-breach pistol.  For years, this pistol was not available for the commercial market and was exclusively for the Italian Armed Forces and Police.  This pistol paved the way for Beretta to, later on, introduce the Beretta 92.  The Modello 1951 was in production from 1953 to 1980.
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